Lexus RX300 (MCU15). Manual — part 215
DI–92
–
DIAGNOSTICS
ENGINE
LEXUS RX300 (RM785E)
5
Check air induction system (See page FI–1).
NG
Repair or replace.
OK
6
Check fuel pressure (See page FI–5).
NG
Check and repair fuel pump, pressure regulator,
fuel pipe line and filter (See page FI–5).
OK
7
Check injector injection (See page FI–22).
NG
Replace injector.
OK
Replace A/F sensor.
8
Perform confirmation driving pattern (See page DI–85).
Go
9
Is there DTC P1133 or P1153 being output again?
YES
Check and replace engine ECU
(See page IN–32).
NO
–
DIAGNOSTICS
ENGINE
DI–93
LEXUS RX300 (RM785E)
10
Did vehicle runs out of fuel in past?
NO
Check for intermittent problems
(See page DI–3).
YES
DTC P1133 or P1153 is caused by running out
of fuel.
A02032
HAFL
ON
HAFR
(+)
(–)
DI–94
–
DIAGNOSTICS
ENGINE
LEXUS RX300 (RM785E)
DTC
P1135
A/F Sensor Heater Circuit Malfunction (Bank
1 Sensor 1)
DTC
P1155
A/F Sensor Heater Circuit Malfunction (Bank
2 Sensor 1)
CIRCUIT DESCRIPTION
Refer to DTC P0125 on page DI–42.
DTC No.
DTC Detecting Condition
Trouble Area
P1135
When the heater operates, heater current exceeds 8 A
S Open or short in heater circuit of A/F sensor
A/F
h
t
P1135
P1155
Heater current of 0.25 A or less when the heater operates
S A/F sensor heater
S Engine ECU
WIRING DIAGRAM
Refer to DTC P0125 on page DI–42.
INSPECTION PROCEDURE
HINT:
Read freeze frame data using hand–held tester or OBD scan tool. Because freeze frame records the engine
conditions when the malfunction is detected. When troubleshooting, it is useful for determining whether the
vehicle was running or stopped, the engine was warmed up or not, the air–fuel ratio was lean or rich, etc.
at the time of the malfunction.
1
Check voltage between terminals HAFL, HAFR of engine ECU connector and
body ground.
PREPARATION:
(a)
Remove the glove compartment (See page FI–70).
(b)
Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals HAFL, HAFR of the en-
gine ECU connector and body ground.
OK:
Voltage: 9 – 14 V
OK
Check and replace engine ECU (See page
IN–32).
NG
DI2H9–06
–
DIAGNOSTICS
ENGINE
DI–95
LEXUS RX300 (RM785E)
2
Check resistance of A/F sensor heater (See page FI–56).
NG
Replace A/F sensor.
OK
3
Check A/F sensor heater relay (Marking: A/F) (See page FI–56).
NG
Replace A/F sensor heater relay.
OK
Check and repair harness or connector between A/F sensor heater relay and A/F sensor, and A/F
sensor and engine ECU (See page IN–32).
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